Assigbtob to the new  martrts



I. M. CLARKE.

LE NS.

APPLICATION run) AUG. 9. 19m.

Patented em. 9, 1919.

mfm

Pittsburgh, in the county of Allegheny and.

IRA 1VL CLARKE, OF PITTSBURGH, PENNSYLVANIA, ASS IG-NOR TO THE NEW MARTINS- VILLE GLASS MANUFACTURING COMPANY, OF NEW MARTINSVILLE, WEST VIRGINIA, A CORPORATION OF WEST VIRGINIA.

LENS.

To all whom it may concern:

Be it known that I, IRA M. CLARKE a citizen of the United States, and resident .of

State of Pennsylvania, have invented a new and useful Improvement in Lenses; and I do herebyfdeclare the'following to be a full, clear, and exact description thereof.

My invention relates to lenses and has special reference to such lenses for use as a headlight for automobiles and other vehicles.

The object of my invention is to provide a cheap, simple and efficient form of lens which will diffuse the light when used on a vehicle,as well as one which also, when so used, will prevent glaring.

' To these ends my invention'consists, generally stated, in the novel arrangement,-construction and combinationof parts, as hereinafter more specifically 'set forth and described, and particularly pointed out in the claims.

To enable others skilled in the art to which my invention appertains to construct and use my improved lens, I will describe the same more fully, referring to the accompanying drawing, in which- Figiire 1 is a face view of my improved lens; t

Fig. 2 is a vertical section of the same on the line 22 Fig. 1; I

Fig. 3 is a cross-section of the same on the line 3-3 Fig. 1, looking in the direction 1 of the arrows;

Fig. 4 is a like view taken on the line M Fig. 1, looking in the direction of the arrows; and I Fig. 5 is an edge view. of the same.

Like symbols of reference herein indicate like parts in each of the figures of the draw- A in'g.

lens A i's of circular or disk shape in form, and with the exception of a slight annular."

rib 1 on the back or rear surface 2, such surface is of substantially fiat form, and :has the annular flange or run 3 at its outer ex-,

'tre'mity or periphery, for securing or hold .ing such lens in a lamp or other lighting device (not shown). Extending outwardly Specification of Letters Patent. Patented Sept. 9, 11.919; Application filed August 9, 1918. Serial No. $49,197.

from such flange or rim 3 is the front face 4:, which is connected to such rim by the annular outwardly extending flange portion 5, in line with the rib 1, for forming the pe riphery of such face and such face tapers inwardly, as at 5, and is provided, with the concave or bulbous prism portion 6 and prism portion 7 above the same. This top' prism portion 7 is formed above the horizontal center or axis of the front face l and connects with said face through an outwardly extending horizontal lip 7, and such portion is provided with the two faces 8, which are formed on each side of the vertical center oraxis of such portionand are curved inwardly and downwardly from the periphery or flange portion 5 to such center or axis. The outer edge 9 on the concave or bulbous portion 6 is formed on tapered bevel, as at 10, from the horizontal lip 7, and by reason of the form of the inclined faces 8, such edge .curves inwardly, as at 11, from said lip,

while suclredge slightly below suchlip; on such concave or bulbous portion 6 curves upwardly and outwardly to such lip and outwardly anddownwardly to the bottom of the vertical center or axis of such'portion from approximately the horizontal center or axis of said portion, as at 12 and 13, respectively. Q

Inthe use and operation of my improved lens A when applied to the headlight of an automobile it will be obvious that the con-' cave or bulbous prism portion 6' will throw the light forwardly and downwardly at a gradually increasing degree from the upper portion to the lower portion of said prism portion, while the inclined top prisni faces 8 will throw the light outwardly to the right and left-respect vely of the driver and also downwardly, thereby giv-in a greater intensity of light immediately 1n frontof the vehicle.

It will thus be seen that in the use of my improved lens there will be a great width of the light therefrom in illuminating the roadway in front of and on each side of the vehicle and also the area-immediately in front of the vehicle. f Various changes in the design and construction of my improved lens ma of the invention, or sacrihcing any, 0 its advantages.

be re sorted to',with out departing from't e s irit.

5 portion with its curved surface formed in one continuous curve outwardly and downwardly, and an upper prism .portion above said lower prism portion and above the horizontal axis of the lens, said upper prism 10 portion being formed of two prisms curved inwardly toward the vertical axis of the lens. 2. A lens of the class described comprising upper and lower prism portions, the upper 1 portion being formed of two prisms curved downwardly and inwardly toward the verti- 15 cal axis of the lens, and the lower portion consisting of a single substantially planeconcave prism, the angularity of the curved surface to the plane surface of said prism uniformly increasing downwardly and lat- 20 erally.

In testimony whereof I, the said IRA M.

CLAnKn,-l1ave hereunto set my hand.

IRA M. CLARKE. Witnesses:

J. N. Coolie, J. M. GnoenEeAN. 

